told to stop laying on my back

Bex • 🧚‍♀️ 2010 🧚‍♀️ 2017 🧚‍♀️ 2018 🧚‍♀️ 2020 girl mama
my midwife told me to stop laying on my back, because the baby weight reduces the blood flow to the placenta. I was not told this last pregnancy and I lay on my back alot. anyone else ?